Investments - Summary of Gross Unrealized Losses and Fair Values of Available-For-Sale Investment Securities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	$ 2,906	$ 261
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(278)	(13)
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0	4,712
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	0	(288)
Available-for-sale securities, continuous unrealized loss position, fair value, total	2,906	4,973
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	(278)	(301)
Common stock
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	322	95
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(11)	(5)
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	0	0
Available-for-sale securities, continuous unrealized loss position, fair value, total	322	95
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	(11)	(5)
Preferred stock
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	197
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(7)
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	0
Available-for-sale securities, continuous unrealized loss position, fair value, total	197
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	(7)
Corporate debt
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	1,242
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(226)
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	0
Available-for-sale securities, continuous unrealized loss position, fair value, total	1,242
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	(226)
Venture capital investments
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	163	163
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(5)	(5)
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	0	0
Available-for-sale securities, continuous unrealized loss position, fair value, total	163	163
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	(5)	(5)
Offshore funds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value		0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss		0
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value		4,712
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss		(288)
Available-for-sale securities, continuous unrealized loss position, fair value, total		4,712
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total		(288)
Mutual funds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	982	3
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(29)	(3)
Available-for-sale securities, continuous unrealized loss position, 12 months or greater, fair value	0	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	0	0
Available-for-sale securities, continuous unrealized loss position, fair value, total	982	3
Available-for-sale securities, continuous unrealized loss position, gross unrealized losses, total	$ (29)	$ (3)